There are usually 28 in a person’s mouth, so we should listen to the doctor’s ______ to protect(保护)them.
—Do you believe that paper is made ____ wood? —Yes, I do. And you can see that books are made ____ paper.
—Let’s go to the church tomorrow, shall we? —Why not _______ there on Sunday?
The kids found it hard to ________ because there is a party in the next room. A. keep still B. make a mess C. in silence
Tom Sawyer is very _______ because he is willing to do things which are difficult or dangerous. A. hard-working B. brave C. polite
The APEC meeting is the main _______ of Beijing now. A. survey B. director C. event